<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
<script>
	$(document).ready(function(){
		$("button").click(function(){
			$("p.intro").hide();
			/* p태그의 intro클래스만 없어짐 */
		});
	});
</script>
</head>
<body>
<h2 class="intro">This is heading</h2>
<p>This is ~~~</p>
<p class="intro"> This is p.intro</p>
<button>click</button>
</body>
</html>